GET
1.创建
const xhr = new XMLHttpRequest()
兼容
const xhr = new ActiveXObject('Mscrosoft.XMLHTTP')
2.请求
xhr.open('GET','./Login.php?username=wzq&password=123'.,true)
3.发送
xhr.send()
4.获取
xhr.onreadystatechang = function (){
判断ajax的状态码
if(xhr.readyState === 4){
判断HTTP码
200-299
304无更新数据
if(xhr..status>=200&&xhr.status<300||xhr.status===304){
console.log(xhr.responseText)
}
}
}
POST
1.创建
const xhr = new XMLHttprRequest()
2.请求
xhr.open('POST','./login.php',true)
如果使用post必须设置请求头
xhr.setRequestHeader('content-type','application/x-www-form-url-encoded')
3.发送
xhr.send(`username=wzq&password=123`)
4.获取
xhr.onreadystatechang = function () {
判断AJAX的状态码
if(xhr.readyState === 4){
if(xhr.status >=200&&xhr.status <300||xhr.status===304){
console.log(xhr.responseText)
}
}
}
